CN216923372U - Electromagnetic valve - Google Patents

Abstract

The utility model provides an electromagnetic valve, includes the valve rod and moves the iron core, its characterized in that, the valve rod with it is fixed to move the iron core cartridge, the electromagnetic valve includes cartridge adaptation axial segment, cartridge adaptation axial segment include but not limited to by the valve rod with it forms to move the radial cooperation of iron core, cartridge adaptation axial segment includes two sections at least interference fit sections, follows the axial of cartridge adaptation axial segment, interference fit section interval sets up. According to the arrangement, the insertion interference fit relation between the valve rod and the movable iron core is realized by at least two interference fit sections which are arranged at intervals, on one hand, high-precision machining is not required to be adopted on the full length of the insertion fit shaft section between the valve rod and the movable iron core, and the machining cost is reasonably controlled; meanwhile, interference fit sections are arranged at intervals in a sectional mode, and good guiding and centering effects can be guaranteed.

Description

Electromagnetic valve

Technical Field

The utility model relates to the technical field of automobile parts, in particular to an electromagnetic valve.

Background

In the automotive field, solenoid valves are control switches in automotive air conditioning systems or vehicle heat pump systems. The valve rod of the electromagnetic valve executes corresponding operation based on the driving of the movable iron core. The movable iron core and the valve rod of the current electromagnetic valve are connected in a fixed interference fit mode, the movable iron core and the valve rod have the function of guiding and centering on the basis of reliable connection, and the requirement on the precision of the machining size of an interference fit face is high. Referring specifically to the configuration of the exemplary interference fit segment shown in fig. 1 and 2.

As shown in fig. 1, a short interference fit section a1 is located at one side end along the fitting axial direction of the valve rod 01 and the movable iron core 02, so that the press-in assembly operation is simple, but the guide function and the centering accuracy are directly affected. As shown in fig. 2, the interference fit section a2 between the movable iron core 02 and the valve rod 01 is relatively long, the guiding is relatively good, the centering accuracy is good, but the axial dimension of the fitting surface is relatively long, the processing difficulty and the assembling difficulty are both increased, and the processing cost and the assembling cost are both increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the electromagnetic valve which is beneficial to good guiding function and centering precision between the valve rod and the movable iron core through structure optimization, and reasonably controls the processing cost and the assembly cost of a product.

The utility model provides a solenoid valve which comprises a valve rod and a movable iron core and is characterized in that the valve rod and the movable iron core are fixedly inserted, the solenoid valve comprises an inserted adaptive shaft section, the inserted adaptive shaft section comprises but is not limited to a shaft rod and the movable iron core which are radially matched, the inserted adaptive shaft section comprises at least two interference fit sections, and the interference fit sections are arranged at intervals along the axial direction of the inserted adaptive shaft section.

According to the arrangement, the insertion interference fit relation between the valve rod and the movable iron core is realized by at least two interference fit sections which are arranged at intervals, on one hand, high-precision machining is not required to be adopted on the full length of the insertion fit shaft section between the valve rod and the movable iron core, and the machining cost is reasonably controlled; meanwhile, interference fit sections are arranged at intervals in a sectional mode, and good guiding and centering effects can be guaranteed.

Drawings

Fig. 1 and fig. 2 are schematic diagrams without showing the configuration of the interference fit section between the valve rod and the movable iron core of the solenoid valve in the background art respectively;

FIG. 3 is a schematic overall structure diagram of a solenoid valve according to an embodiment of the present application;

FIG. 4 is a cross-sectional view taken at section I-I of FIG. 3;

fig. 5 is a schematic view of an assembled relationship of the core assembly 3 shown in fig. 3;

FIG. 6 is an enlarged view of section II of FIG. 5;

FIG. 7 is a schematic illustration of the valve stem shown in FIG. 3;

FIG. 8 is an axial cross-sectional view of FIG. 7;

FIG. 9 is a schematic structural view of the plunger shown in FIG. 3;

FIG. 10 is an axial cross-sectional view of FIG. 9;

FIG. 11 is a partial schematic view of another embodiment of the valve stem in assembled relation with the plunger;

fig. 12 is a partial schematic view of a valve stem and a plunger in an assembled relationship according to yet another embodiment.

In the figure:

the valve comprises a valve body 1, an accommodating cavity 11, a first valve port 12, a first channel 13, a second channel 14, a valve core assembly 2, a piston 21, a second valve port 211, a through flow channel 212, an inner concave cavity 213, a first elastic element 22, a first sealing gasket 23, a pressing sheet 24, an iron core assembly 3, a static iron core 31, a through hole 311, a movable iron core 32, a second mounting part 32a, a second mounting part 32b, an insertion hole 321, a small-diameter hole segment 3211, a large-diameter hole segment 3212, a second elastic element 33, a second sealing gasket 34, a valve rod 35, a first mounting part 35a, a first mounting part 35b, a small-diameter rod segment 351, a large-diameter rod segment 352, a coil assembly 4, a valve seat cover 5 and a guide part 51.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Without loss of generality, the present embodiment will be described with respect to the solenoid valve shown in the drawings, and the specific configuration and mechanism of action thereof will be described in detail. It should be understood that the principle of adapting the coil assembly and the core assembly of the solenoid valve is not the core invention of the present application and can be implemented by those skilled in the art based on the prior art, so that the solenoid valve claimed in the present application is not limited to the essential limitations.

Referring to fig. 3 and 4, fig. 3 is a schematic overall structure diagram of the solenoid valve according to the present embodiment, and fig. 4 is a sectional view taken at a position of section i-i in fig. 3.

The electromagnetic valve comprises a valve body 1, a valve core assembly 2, an iron core assembly 3 and a coil assembly 4. The coil assembly 4 is energized, and the movable iron core of the iron core assembly 3 displaces to close or open the valve, for example, when the normally open type solenoid valve shown in fig. 4 is energized and closed, the moving direction of the movable iron core 32 faces the valve port. Of course, in the case of a normally closed solenoid valve, when the solenoid valve is energized and opened, the moving direction of the plunger 32 is away from the valve port.

Wherein, the iron core assembly 3 includes static iron core 31 and movable iron core 32, and both axial are relative to each other and are provided with second elastic component 33 between the two, and under the normality, this second elastic component 33 can precompress and set up between static iron core 31 and movable iron core 32 to movable iron core 32 keeps the open valve state. The coil assembly 4 is fitted around the periphery of the core assembly 3, and the movable core 32 moves toward the stationary core 31 based on the magnetic flux generated after energization.

As shown in the figure, a valve rod 35 is fixed to one end of the movable iron core 32 facing the stationary iron core 31, the valve rod 35 extends through a middle through hole 311 of the stationary iron core 31, and a second gasket 34 adapted to the second valve port 211 is fixed to the extending end of the valve rod 35. The second sealing pad 34, which is displaced synchronously with the movable core 32 when the movable core 32 moves toward the stationary core 31, can seal the second valve port 211 on the piston 21, so as to realize the valve control operation.

The valve body 1 has a receiving cavity 11, and the valve seat cover 5 is inserted and fixed at an opening of the receiving cavity 11 facing the coil assembly 4 and sealed with the valve body 1 to form an internal valve cavity. Part of the core assembly 3 is inserted and fixed in the axial through hole of the valve seat cover 5. The valve core assembly 2 is placed in the accommodating cavity 11, and as shown in fig. 4, the valve seat cover 5 extends axially toward the accommodating cavity 11 to form a guide portion 51 for guiding the movement of the piston 21. It will be understood that the axial dimension of the guide 51 with respect to the housing 11 is not limited to the dimensional ratio shown in the figures; here, the piston 21 is disposed with a sliding fit between a part of the outer peripheral surface thereof and the guide portion 51 so as to satisfy the operational displacement of the piston 21 and a good guide function.

It should be understood that the adapting portion of the piston 21 for the guide portion 51 is not limited to be disposed at the end of the piston opposite to the stationary core 31, and may be disposed at a position axially intermediate the piston 21 according to the design requirements of a specific product.

The valve core assembly 2 comprises a piston 21 and a first elastic member 22, the first elastic member 22 is axially arranged between the piston 21 and the valve body 1, and the first elastic member 22 is in a compressed state and is used for providing a reset acting force in the opening process of the valve port. Specifically, the piston 21 has an axial through flow passage 212, and the outer periphery of the through flow passage 212, which is opposite to the first valve port 12, is provided with a first gasket 23, and the first gasket 23 can be engaged with or disengaged from the first valve port 12 under the driving of the piston 21. In a specific implementation, the first seal 23 may be fixed to the end of the piston 21 by a pressing piece 24.

Of course, in other embodiments, the second sealing pad 23 may be fixed to the piston 21 in other manners.

As shown in fig. 4, a second valve port 211 is formed through the flow passage 212 at the opposite end to the core assembly 3 to cooperate with a second sealing gasket 34 at the working end of the plunger 32, and the second sealing gasket 34 can be engaged with or disengaged from the second valve port 211 by the driving of the plunger 32.

As shown in fig. 4 again, the piston 21 has an inner concave cavity 213, and the inner concave cavity 213 is formed by being recessed inward from an axial end surface of the piston 21 opposite to the stationary core 31 in the axial direction of the solenoid valve, so as to form a pressure medium acting chamber at the initial stage of the valve operation. In other specific implementations, the concave cavity may also be formed by being recessed inward from an axial end surface of the stationary core 31 opposite to the piston 21 (not shown in the figure), and of course, the concave cavity may also be formed by being recessed inward from the two opposite axial end surfaces (not shown in the figure), which may also achieve the function of forming the pressure medium acting cavity.

The valve body 1 has a first valve port 12, a first channel 13 and a second channel 14, the first channel 13 is communicated with the accommodating cavity 11, the second channel 14 can be communicated with the accommodating cavity 11 through the first valve port 12, that is, when the second gasket 34 is separated from the first valve port 12 in the valve-opening state, the second channel 14 is communicated with the accommodating cavity 11 through the first valve port 12.

Wherein, the fixed connection between the valve rod 35 and the movable iron core 32 is established based on the interference fit relationship, and the structure is simple and the assembly is convenient. Referring to fig. 5 and 6 together, fig. 5 is a schematic view illustrating an assembled relationship of the core assembly 3 shown in fig. 3, and fig. 6 is an enlarged view of a portion ii of fig. 5.

As shown in the figure, an insertion hole 321 is formed at the mating end of the plunger 32 and the valve stem 35, and the rod body of the valve stem 35 is inserted into the insertion hole 321 to establish insertion fixation with an interference fit relationship. Of course, in other specific implementations, the valve rod 35 may be provided with an insertion hole for inserting the movable iron core adapting end, and the assembly may also be completed based on the interference fit relationship.

In this embodiment, the interference fit relationship between the movable iron core 32 and the valve rod 35 includes two sections of interference fit sections: a first interference fit section B1 and a second interference fit section B2, as shown, the first interference fit section B1 and the second interference fit section B2 are configured to: and the valve rod 35 and the movable iron core 32 are formed on the plug-in adaptive shaft section B in the radial direction of the electromagnetic valve at intervals.

The term "plug-in fitting shaft section" is understood to mean that the valve rod 35 is plugged into the movable core 32 over an axial dimension, i.e. in a radially fitting manner. In the scheme, interference fit is not adopted on the full length of the plug-in mounting adaptive shaft section B, so that the processing cost can be effectively reduced. Meanwhile, the first interference fit section B1 and the second interference fit section B2 which are arranged at intervals in the axial direction can keep good guiding and centering effects. Of course, as other embodiments, the plug-in adapter shaft segment may be formed by other parts besides the valve stem 35 and the plunger 32, for example, a bushing or other transition piece may be added between the valve stem 35 and the plunger 32.

In this embodiment, the outer peripheral surface of the valve rod 35 has two first mounting portions 35a and 35B axially spaced apart, correspondingly, the wall of the plunger 32 forming the insertion hole 321 has two second mounting portions 32a and 32B axially spaced apart, the first mounting portion 35a and the second mounting portion 32a are in interference fit to form a first interference fit section B1, and the first mounting portion 35B and the second mounting portion 32B are in interference fit to form a second interference fit section B2.

In other specific implementations, in the case that the valve rod 35 is provided with other plural first mounting portions, and the movable iron core 32 is provided with other plural second mounting portions, the first mounting portions on the valve rod 35 and the second mounting portions on the movable iron core 32 correspond to each other one by one, and form the interference fit sections respectively. Of course, in the case where the valve rod 35 is provided with the insertion hole for inserting the fitting end of the movable core, the actual installation position of the corresponding installation portion is reversed.

In order to further improve the assembly manufacturability, the basic dimensions of the first interference fit section B1 and the second interference fit section B2 may be further optimized. The basic size of the first interference fit section B1 is smaller than that of the second interference fit section B2, so that on the basis of the respective basic sizes, the corresponding interference fit relation can be ensured by setting different tolerance band sizes; as shown in fig. 6, in the axial direction of the solenoid valve, the first interference fit section B1 is located on one side of the insertion-fit shaft section, that is, on the side where the insertion end of the valve stem 35 is located, and the second interference fit section B2 is located on the other side of the insertion-fit shaft section, that is, on the side where the hole edge of the insertion hole 321 is located.

Referring to fig. 7 and 8 together, fig. 7 is a structural schematic view of the valve stem shown in fig. 3, and fig. 8 is an axial sectional view of fig. 7. The valve stem 35 includes a small-diameter stem section 351 having a first basic dimension D, and a large-diameter stem section 352 having a second basic dimension D, which are disposed adjacent to each other in the axial direction, the small-diameter stem section 351 being located on the insertion end side of the valve stem 35, and the first basic dimension D being smaller than the second basic dimension D.

Referring to fig. 9 and 10 together, fig. 9 is a schematic structural view of the movable iron core shown in fig. 3, and fig. 10 is an axial sectional view of fig. 9. Correspondingly, the insertion hole 321 of the plunger 32 includes a small-diameter hole segment 3211 with a first basic size D and a large-diameter hole segment 3212 with a second basic size D, which are arranged adjacent to each other in the axial direction, and the large-diameter hole segment 3212 is located at the hole edge side of the insertion hole 321.

Here, a part of the small-diameter rod section 351 of the valve rod 35 forms a first mounting portion 35a, and forms a first interference fit section B1 with a second mounting portion 32a formed by the small-diameter hole section 3211 of the movable iron core 32; a second mounting portion 32B is formed by a part of the large-diameter hole section 3212 of the plunger 32, and forms a second interference fit section B2 with the first mounting portion 35B formed by the large-diameter rod section 352 of the valve rod 35.

As further shown in fig. 5 and 6, after the assembly is completed, the small-diameter rod section 351 is fitted to the small-diameter hole section 3211, and a first interference fit section B1 is formed based on the first basic size d; the large diameter rod segment 352 mates with the large diameter bore segment 3212, forming a second interference fit segment B2 based on the second base dimension D. Based on different basic sizes, the first interference fit section B1 and the second interference fit section B2 are arranged in a radially staggered mode, and a better guiding function is achieved in the assembling process; meanwhile, the first interference fit section B1 and the second interference fit section B2 are respectively located at two axial end sides of the insertion fit shaft section B, and centering reliability can be guaranteed to the maximum extent.

In addition, the plug-in mounting adaptive shaft section between the two interference fit sections can adopt clearance fit. In the present embodiment, an annular separation space B3 shown in fig. 6 is formed between the large-diameter hole section 3212 and the small-diameter rod section 351 between the first interference-fit section B1 and the second interference-fit section B2. That is, the valve stem 35 is shown as a clearance fit with the plunger 32 between the axially intermediate regions B3. The two sections of axial size difference are utilized to achieve the interference fit function of two spaced configurations, and the machining manufacturability is better.

To facilitate the fitting therebetween, a pitch L1 between the insertion starts of the adjacent two first fitting parts (35a and 35b) in the insertion direction may be the same as a pitch L2 between the insertion starts of the adjacent two second fitting parts (32a and 32 b).

The "insertion start end" herein refers to a position where the first attaching part and the second attaching part start to be interference-fitted in the insertion direction.

Thus, based on the above-mentioned design of the basic size, at the initial stage of the valve rod 35 being inserted into the insertion hole 321, there is a large radial clearance between the insertion end of the valve rod 35 and the insertion hole 321, and when the small-diameter rod segment 351 reaches the insertion start position where the interference fit relation with the small-diameter hole segment 3211 is established, the large-diameter rod segment 352 can reach the insertion start position where the interference fit relation with the large-diameter hole segment 3212 is established. The two interference fit sections can be subjected to interference extrusion simultaneously, and the assembly is relatively simple.

It should be noted that the interference fit sections arranged at intervals in the axial direction may be configured with other plural sections. For example, but not limited to, the three interference fit sections (C1, C2, C3) shown in fig. 11 are arranged at intervals, and the three interference fit sections are arranged at equal intervals, but may be arranged at unequal intervals. Similarly, the plug-in fit shaft section between two adjacent interference fit sections adopts clearance fit.

Of course, in other specific implementations, the interference fit sections axially spaced may also adopt other plural sections of more than three sections, and each interference fit section may also adopt a configuration mode of non-equal spacing.

In addition, for the interference fit sections of other complex sections, different basic sizes can be adopted, and the interference fit sections are staggered in the radial direction to form corresponding interference fit sections. In a particular application, one portion of the interference fit section is a first interference fit section having a relatively small base size, and the other portion of the interference fit section is a second interference fit section having a relatively large base size. For example, but not limited to, the four segments shown in fig. 12, wherein the four segments of the interference fit segments (E1, E2, E3, E4) are arranged at intervals, the interference fit segments E1, E2 are formed based on the first basic size D, and the interference fit segments E3, E4 are formed based on the second basic size D, so as to have better guiding function during the assembling process.

In addition, for the specific implementation of the interference fit sections configured as at least three sections, the interference fit sections are preferably configured at both side ends of the plug-in fit shaft section B, so as to ensure the centering reliability to the maximum extent.

Here, the partial schematic of the assembling relationship between the valve stem and the plunger shown in fig. 11 and 12 is the same as the region shown in fig. 6, and the same reference numerals are used to illustrate the same functional components and structures in the drawings for the sake of clarity in illustrating the differences and connections between the embodiments.

In addition to the foregoing embodiments of creating the interference fit sections based on two basic dimensions, each interference fit section may also be configured with different basic dimensions according to specific product design requirements, and gradually changed (not shown in the figure). It should be understood that it is within the scope of the claimed invention to achieve a reasonable balance of tooling assembly costs and guiding and centering features.

The ordinal numbers "first" and "second" used herein are used only to describe a structure or acts of like function in the claims. It is to be understood that the use of the ordinal numbers "first" and "second" does not constitute an understandable limitation on the technical solutions claimed in the present application.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims (10)

1. The utility model provides an electromagnetic valve, includes the valve rod and moves the iron core, its characterized in that, the valve rod with it is fixed to move the iron core cartridge, the electromagnetic valve includes cartridge adaptation axial segment, cartridge adaptation axial segment include but not limited to by the valve rod with it forms to move the radial cooperation of iron core, cartridge adaptation axial segment includes two section at least interference fit sections, follows the axial of cartridge adaptation axial segment, interference fit section interval sets up.

2. The solenoid valve according to claim 1, wherein: the valve rod is in cartridge adaptation shaft part has two at least first installation departments that set up along axial interval, it is in to move the iron core cartridge adaptation shaft part has two at least second installation departments that set up along axial interval, first installation department with second installation department one-to-one to interference fit forms the interference fit section.

3. The solenoid valve according to claim 2, wherein a pitch between insertion starting ends of two adjacent first mounting portions is the same as a pitch between insertion starting ends of two adjacent second mounting portions in the insertion direction.

4. The electromagnetic valve according to claim 2 or 3, wherein the interference fit section includes a first interference fit section and a second interference fit section, a basic size of the first interference fit section is smaller than a basic size of the second interference fit section, the first interference fit section is located on one side of the cartridge fit shaft section in an axial direction of the cartridge fit shaft section, and the second interference fit section is located on the other side of the cartridge fit shaft section.

5. The solenoid valve as claimed in claim 4, wherein the plunger has an insertion hole into which one end of the stem is inserted to establish the insertion fixation, the first mounting portion is formed on an outer peripheral surface of the stem, and the second mounting portion is formed on a wall of the insertion hole.

6. The solenoid valve according to claim 5, wherein said valve stem includes a small-diameter stem section and a large-diameter stem section axially adjacent to said small-diameter stem section, said small-diameter stem section having a basic size smaller than that of said large-diameter stem section, said insertion hole includes a small-diameter bore section having a basic size smaller than that of said large-diameter bore section and a large-diameter bore section axially adjacent to said small-diameter bore section, part of said small-diameter stem section and part of said small-diameter bore section constitute said first interference fit section, and part of said large-diameter bore section and part of said large-diameter stem section constitute said second interference fit section.

7. The electromagnetic valve according to claim 6, wherein the cartridge-fitting shaft segment further has an annular separation space, a part of the large-diameter bore segment and a part of the small-diameter rod segment cooperate to form the annular separation space, and the annular separation space is located between the first interference-fitting segment and the second interference-fitting segment in an axial direction of the cartridge-fitting shaft segment.

8. The electromagnetic valve according to claim 1, 2 or 3, wherein the interference fit section is provided in at least three sections.

9. The solenoid valve of claim 8 wherein each of said interference fit segments are equally spaced apart.

10. The electromagnetic valve according to claim 1, 2 or 3, wherein the cartridge-adapted shaft section located between the two interference fit sections is in clearance fit.

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